<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>表单全选，取消，反选操作</title>
	<script type="text/javascript">
		 window.onload=function(){
       var a=19;
       a%2==0?alert(true):alert(false);
       alert(a%2);
		 }
	</script>
</head>
<body>
</body>
</html>